First Generation Ascots > Tech Section
Dyno tuning
scottly:
Unfortunately, I never made a base-line run with the stock air-box and snorkel. The modification that resulted in the huge increase in main jet size the most was the K&N filter:
http://ascot500.com/index.php?topic=214.0
It would be nice to be able to post a 500K size graph; at least it would be easier to read, not to mention much easier for me to size. ;D
J6G1Z:
I believe that a box stock FT produces about 24-26HP. So you are looking at a sizeable increase.
Do you know how much difference the muffler swap made?
Do you have a K&N in the OEM airbox, or did you remove the airbox & install the filter onto the carb inlet?
I used to run K&N filters when I lived in the Arizona desert. I found that the real fine dust would get past the filter & on into the intake tract, carb, etc. Next time you have the K&N out, take a white rag & try wiping the inside of the filtered/clean side. If the rag shows dirt, it's getting past the filter. I swapped to UNI filters & have not had the problem since.
J.
scottly:
I can't really say how much difference the muffler made; looking back at my notes, there was no difference between the stock muffler and an open header, but the bike was still very lean at that early stage of testing.
I removed the stock airbox, and adapted the K&N filter to the stock rubber tube that attaches to the carburetor. I did apply some filter oil to the inside of the tube, and now that I've had the bike off road in dusty conditions, I should check to see if grit is making it's way past the filter.
J6G1Z:
Are you still running the original exhaust downtubes?
Have you ever had them off & looked down inside the head pipes? I was surprised by how much the inner tubing narrows down the flow path. Here are some pics & measurements that I took from the OEM head pipes & the ThumperStuff header.
http://ascot500.com/index.php?topic=138.msg1464#msg1464
I would like to see a back to back dyno testing of the header. Some folks feel that the stock FT runs better off the OEM head pipes with the smaller tubing I.D. Maybe you can wrangle a deal from Mark at ThumperStuff for testing purposes.
Good luck
J.
J6G1Z:
--- Quote from: scottly on July 16, 2014, 11:13:46 pm ---It would be nice to be able to post a 500K size graph; at least it would be easier to read, not to mention much easier for me to size. ;D
--- End quote ---
Some wishes can come true. At least once the Admin guy figures out the right screen to make the changes. :-[ ;D
As far as re-sizing pictures, this program is free & I really like using it. You can do a whole batch of pics at one time. It's called: "Image Optimizer" at: http://xat.com/io/index.html
Keep up the good work
J.
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